2 * Copyright (C) 1995-1999 Jeffrey A. Uphoff
3 * Major rewrite by Olaf Kirch, Dec. 1996.
4 * Modified by H.J. Lu, 1998.
5 * Tighter access control, Olaf Kirch June 1999.
21 #include <arpa/inet.h>
28 #include "ha-callout.h"
30 notify_list * rtnl = NULL; /* Run-time notify list. */
33 * Reject requests from non-loopback addresses in order
34 * to prevent attack described in CERT CA-99.05.
37 caller_is_localhost(struct svc_req *rqstp)
39 struct sockaddr_in *sin = nfs_getrpccaller_in(rqstp->rq_xprt);
40 struct in_addr caller;
42 caller = sin->sin_addr;
43 if (caller.s_addr != htonl(INADDR_LOOPBACK)) {
44 xlog_warn("Call to statd from non-local host %s",
52 * Services SM_MON requests.
55 sm_mon_1_svc(struct mon *argp, struct svc_req *rqstp)
57 static sm_stat_res result;
58 char *mon_name = argp->mon_id.mon_name,
59 *my_name = argp->mon_id.my_id.my_name;
60 struct my_id *id = &argp->mon_id.my_id;
63 struct sockaddr_in my_addr = {
64 .sin_family = AF_INET,
65 .sin_addr.s_addr = htonl(INADDR_LOOPBACK),
68 struct hostent *hostinfo = NULL;
70 xlog(D_CALL, "Received SM_MON for %s from %s", mon_name, my_name);
72 /* Assume that we'll fail. */
73 result.res_stat = STAT_FAIL;
74 result.state = -1; /* State is undefined for STAT_FAIL. */
76 /* 1. Reject any remote callers.
77 * Ignore the my_name specified by the caller, and
78 * use "127.0.0.1" instead.
80 if (!caller_is_localhost(rqstp))
83 /* 2. Reject any registrations for non-lockd services.
85 * This is specific to the linux kernel lockd, which
86 * makes the callback procedure part of the lockd interface.
87 * It is also prone to break when lockd changes its callback
88 * procedure number -- which, in fact, has now happened once.
89 * There must be a better way.... XXX FIXME
91 if (id->my_prog != 100021 ||
92 (id->my_proc != 16 && id->my_proc != 24))
94 xlog_warn("Attempt to register callback to %d/%d",
95 id->my_prog, id->my_proc);
100 * Check hostnames. If I can't look them up, I won't monitor. This
101 * might not be legal, but it adds a little bit of safety and sanity.
104 /* must check for /'s in hostname! See CERT's CA-96.09 for details. */
105 if (strchr(mon_name, '/') || mon_name[0] == '.') {
106 xlog(L_ERROR, "SM_MON request for hostname containing '/' "
107 "or starting '.': %s", mon_name);
108 xlog(L_ERROR, "POSSIBLE SPOOF/ATTACK ATTEMPT!");
110 } else if ((hostinfo = gethostbyname(mon_name)) == NULL) {
111 xlog_warn("gethostbyname error for %s", mon_name);
115 /* my_name must not have white space */
116 for (cp=my_name ; *cp ; cp++)
117 if (*cp == ' ' || *cp == '\t' || *cp == '\r' || *cp == '\n')
121 * Hostnames checked OK.
122 * Now choose a hostname to use for matching. We cannot
123 * really trust much in the incoming NOTIFY, so to make
124 * sure that multi-homed hosts work nicely, we get an
125 * FQDN now, and use that for matching
127 hostinfo = gethostbyaddr(hostinfo->h_addr,
129 hostinfo->h_addrtype);
131 dnsname = xstrdup(hostinfo->h_name);
133 dnsname = xstrdup(my_name);
135 /* Now check to see if this is a duplicate, and warn if so.
136 * I will also return STAT_FAIL. (I *think* this is how I should
139 * Olaf requests that I allow duplicate SM_MON requests for
140 * hosts due to the way he is coding lockd. No problem,
141 * I'll just do a quickie success return and things should
146 while ((clnt = nlist_gethost(clnt, mon_name, 0))) {
147 if (statd_matchhostname(NL_MY_NAME(clnt), my_name) &&
148 NL_MY_PROC(clnt) == id->my_proc &&
149 NL_MY_PROG(clnt) == id->my_prog &&
150 NL_MY_VERS(clnt) == id->my_vers &&
151 memcmp(NL_PRIV(clnt), argp->priv, SM_PRIV_SIZE) == 0) {
152 /* Hey! We already know you guys! */
154 "Duplicate SM_MON request for %s "
155 "from procedure on %s",
158 /* But we'll let you pass anyway. */
161 clnt = NL_NEXT(clnt);
165 * We're committed...ignoring errors. Let's hope that a malloc()
166 * doesn't fail. (I should probably fix this assumption.)
168 if (!(clnt = nlist_new(my_name, mon_name, 0))) {
169 xlog_warn("out of memory");
173 NL_ADDR(clnt) = my_addr.sin_addr;
174 NL_MY_PROG(clnt) = id->my_prog;
175 NL_MY_VERS(clnt) = id->my_vers;
176 NL_MY_PROC(clnt) = id->my_proc;
177 memcpy(NL_PRIV(clnt), argp->priv, SM_PRIV_SIZE);
178 clnt->dns_name = dnsname;
181 * Now, Create file on stable storage for host.
183 if (!nsm_insert_monitored_host(dnsname,
184 (struct sockaddr *)(char *)&my_addr, argp)) {
185 nlist_free(NULL, clnt);
189 /* PRC: do the HA callout: */
190 ha_callout("add-client", mon_name, my_name, -1);
191 nlist_insert(&rtnl, clnt);
192 xlog(D_GENERAL, "MONITORING %s for %s", mon_name, my_name);
194 result.res_stat = STAT_SUCC;
195 /* SUN's sm_inter.x says this should be "state number of local site".
196 * X/Open says '"state" will be contain the state of the remote NSM.'
197 * href=http://www.opengroup.org/onlinepubs/9629799/SM_MON.htm
198 * Linux lockd currently (2.6.21 and prior) ignores whatever is
199 * returned, and given the above contraction, it probably always will..
200 * So we just return what we always returned. If possible, we
201 * have already told lockd about our state number via a sysctl.
202 * If lockd wants the remote state, it will need to
203 * use SM_STAT (and prayer).
205 result.state = MY_STATE;
209 xlog_warn("STAT_FAIL to %s for SM_MON of %s", my_name, mon_name);
214 load_one_host(const char *hostname, const struct sockaddr *sap,
216 __attribute__ ((unused)) const time_t timestamp)
218 const struct sockaddr_in *sin = (const struct sockaddr_in *)sap;
221 clnt = nlist_new(m->mon_id.my_id.my_name,
222 m->mon_id.mon_name, 0);
226 clnt->dns_name = strdup(hostname);
227 if (clnt->dns_name == NULL) {
228 nlist_free(NULL, clnt);
232 xlog(D_GENERAL, "Adding record for %s to the monitor list...",
235 NL_ADDR(clnt) = sin->sin_addr;
236 NL_MY_PROG(clnt) = m->mon_id.my_id.my_prog;
237 NL_MY_VERS(clnt) = m->mon_id.my_id.my_vers;
238 NL_MY_PROC(clnt) = m->mon_id.my_id.my_proc;
239 memcpy(NL_PRIV(clnt), m->priv, SM_PRIV_SIZE);
241 nlist_insert(&rtnl, clnt);
245 void load_state(void)
249 count = nsm_load_monitor_list(load_one_host);
251 xlog(D_GENERAL, "Loaded %u previously monitored hosts");
255 * Services SM_UNMON requests.
257 * There is no statement in the X/Open spec's about returning an error
258 * for requests to unmonitor a host that we're *not* monitoring. I just
259 * return the state of the NSM when I get such foolish requests for lack
260 * of any better ideas. (I also log the "offense.")
263 sm_unmon_1_svc(struct mon_id *argp, struct svc_req *rqstp)
265 static sm_stat result;
267 char *mon_name = argp->mon_name,
268 *my_name = argp->my_id.my_name;
269 struct my_id *id = &argp->my_id;
272 xlog(D_CALL, "Received SM_UNMON for %s from %s", mon_name, my_name);
274 result.state = MY_STATE;
276 if (!caller_is_localhost(rqstp))
279 /* my_name must not have white space */
280 for (cp=my_name ; *cp ; cp++)
281 if (*cp == ' ' || *cp == '\t' || *cp == '\r' || *cp == '\n')
285 /* Check if we're monitoring anyone. */
287 xlog_warn("Received SM_UNMON request from %s for %s while not "
288 "monitoring any hosts", my_name, argp->mon_name);
294 * OK, we are. Now look for appropriate entry in run-time list.
295 * There should only be *one* match on this, since I block "duplicate"
296 * SM_MON calls. (Actually, duplicate calls are allowed, but only one
297 * entry winds up in the list the way I'm currently handling them.)
299 while ((clnt = nlist_gethost(clnt, mon_name, 0))) {
300 if (statd_matchhostname(NL_MY_NAME(clnt), my_name) &&
301 NL_MY_PROC(clnt) == id->my_proc &&
302 NL_MY_PROG(clnt) == id->my_prog &&
303 NL_MY_VERS(clnt) == id->my_vers) {
305 xlog(D_GENERAL, "UNMONITORING %s for %s",
308 /* PRC: do the HA callout: */
309 ha_callout("del-client", mon_name, my_name, -1);
311 nsm_delete_monitored_host(clnt->dns_name);
312 nlist_free(&rtnl, clnt);
316 clnt = NL_NEXT(clnt);
320 xlog_warn("Received erroneous SM_UNMON request from %s for %s",
327 sm_unmon_all_1_svc(struct my_id *argp, struct svc_req *rqstp)
330 static sm_stat result;
332 char *my_name = argp->my_name;
334 xlog(D_CALL, "Received SM_UNMON_ALL for %s", my_name);
336 if (!caller_is_localhost(rqstp))
339 result.state = MY_STATE;
342 xlog_warn("Received SM_UNMON_ALL request from %s "
343 "while not monitoring any hosts", my_name);
348 while ((clnt = nlist_gethost(clnt, my_name, 1))) {
349 if (NL_MY_PROC(clnt) == argp->my_proc &&
350 NL_MY_PROG(clnt) == argp->my_prog &&
351 NL_MY_VERS(clnt) == argp->my_vers) {
353 char mon_name[SM_MAXSTRLEN + 1];
357 "UNMONITORING (SM_UNMON_ALL) %s for %s",
358 NL_MON_NAME(clnt), NL_MY_NAME(clnt));
359 strncpy(mon_name, NL_MON_NAME(clnt),
360 sizeof (mon_name) - 1);
361 mon_name[sizeof (mon_name) - 1] = '\0';
362 temp = NL_NEXT(clnt);
363 /* PRC: do the HA callout: */
364 ha_callout("del-client", mon_name, my_name, -1);
365 nsm_delete_monitored_host(clnt->dns_name);
366 nlist_free(&rtnl, clnt);
370 clnt = NL_NEXT(clnt);
374 xlog(D_GENERAL, "SM_UNMON_ALL request from %s with no "
375 "SM_MON requests from it", my_name);